Update build workflow for enhanced error detection

The build workflow has been updated to include the 'gdb' tool in installation, and to check for segmentation faults both in php_stderr.log and kernel logs. Additionally, core dump processing now verifies the existence of the file before execution to avoid potential errors.

.github/workflows/build.yml

@@ -48,7 +48,7 @@ jobs:
         run: php -i
 
       - name: Install build tools
-        run: sudo apt-get update && sudo apt-get install -y autoconf automake libtool bison re2c
+        run: sudo apt-get update && sudo apt-get install -y autoconf automake libtool bison re2c gdb
 
       - name: Prepare build
         run: |
@@ -67,8 +67,11 @@ jobs:
       - name: Check for segmentation fault
         run: |
           if grep -q "Segmentation fault" php_stderr.log; then
-            echo "Segmentation fault detected"
+            echo "Segmentation fault detected in php_stderr.log"
             cat php_stderr.log
+          elif dmesg | grep -q "segfault"; then
+            echo "Segmentation fault detected in kernel logs"
+            dmesg | tail -n 20
           elif [ -r /tmp/php_errors.log ]; then
             echo "No segmentation fault detected, but php_errors.log is present"
             cat /tmp/php_errors.log
@@ -90,8 +93,10 @@ jobs:
       - name: Display core dump
         run: |
           for corefile in /tmp/core-*; do
-            echo "Processing core dump: $corefile"
-            gdb -q -c "$corefile" php -ex "thread apply all bt full" -ex "quit"
+            if [ -f "$corefile" ]; then
+              echo "Processing core dump: $corefile"
+              gdb -q $(which php) "$corefile" -ex "thread apply all bt full" -ex "quit"
+            fi
           done
         if: always()